The surface chemical properties of cuprous-iodide (CuI) evaporated polymer film containing a precursor reducing agent, 2-isopropoxy-1, 4-naphthoquinone (IPNQ), were markedly affected by UV irradiation. The surface CuI layer was altered selectively by liberates from the polymer layer and attracted zinc vapor deposition. The UV exposure thus resulted in the formation of a fine pattern consisting of CuI products on the surface of film (latent image). The surface property changes were detected by following methods ; i) testing for affinity of zinc vapor, ii) measuring the electro-conductivity of the surface CuI layer, iii) analyzing the chemical components of the specimen. The results suggest that the CuI was reduced by the photo-products of the IPNQ and the major product on the exposed surface was metallic copper attracted the zinc vapor. Thus metal imaging utilizing this phenomenon and the zinc vapor deposition has stability to dark reactions and ability to make fine patters showing the high resolving power of over 500 lp/mm.